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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82aaf5686cfd150df8ca51255ec63133a07df4abd6b1f90b36d0ed8cb37ad1c' 
  AND token = 'KpDt9PRS6YiY5Q87wCFkuZosyuTdK5MRTD5VUoro6+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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