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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '476935285ffc941136346b67f2dc51bcb9386386bdb9d117b842b3141715dd50' 
  AND token = 'thJaJek4hyVlztm6urkR7ob5E7ljNSBt3q1PUI+Fa40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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