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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac9c9c0a6a0b0c4cb5e10675935263cbcb3994eeca84f72d2ea219cce8f6b8b5' 
  AND token = 'Rz1OwrRh03RolVZ7YyfehqZ4EVbNACkgPK0dntFXyyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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