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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68a7ea599f1b24747003afdb3e90548b1ea0a37ecdd0de68cc9c22a41c7b4a64' 
  AND token = 'CsAG4M5LNkPzYO5+Sd3b4VD32Gr0lP2F/IEeAiUDNh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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