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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac04c16f3e0c9b3822c46e0b96910a787d3d9ab95d22979f1d0ebb4ea6f65c7' 
  AND token = 'WX9XZc4BqlLB3C4xnpLkTbHvnkX6AMap7SHN8NJW5qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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