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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54f691b341efef9b6a15247e01b4ab4fa64800e4aee384093cb6a917d3f5cd39' 
  AND token = 'PjKSrDqSn2dLAMmhdZVU5UC1j07L0b0uBNvBrOzgISA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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