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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2538c7d2db2d9b871671e196d792013aa3533b3b714937690a0b11ad07a2f51c' 
  AND token = 'DWeiKnqYZWZjM04B7unHIZIbAJnKej8nqXCRgemJZ+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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