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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5389458b18c0ba0b642d0b3c73bbd03cc701519d524c60ab82890f5d5c05d650' 
  AND token = 'UzgaZjDr9oMEl5wRngG2fKD4Fa5i2ejt1B4pveOpnWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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