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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '770a4625b609a99b26dd9891be6177c572d3f9b3aec533008b3f60e0737df736' 
  AND token = '13kSTOReH4Q7vZil5lFY5OSWz0+yzhajHYj0UTG6WMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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