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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e9720f97fe0781295ad12a5de8abf47fea4832c1461f5a012f1019ec67e118d' 
  AND token = 'u3GlJMFjL6shIe5W8Dbdp1NCSnR4GtlcsTmQkzUOBDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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