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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed90505ba683a4006d6c3c1914633b41697a9f838fca1a8afe6480e8bf1395c0' 
  AND token = 'XoCaAMCiW0M6lQCYCnPtLITxnRZqALdbSowWDSMXTKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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