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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7895fbef4cbb2c29e0dab80dcc9118c95298452f958df041ebea7590a1825efb' 
  AND token = 'MAnBblssoNonmG8z0WSwi3RnWc575C/HCeldZhn3Tp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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