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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b14c496a7e410254420157f247172f9b60de85b071e5c5846790852110195958' 
  AND token = '6b8oTfBk3Pa0Pn2vzmEJIcvpU/F1DMZOgl1DDeihy0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}