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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a7ee772535fd4cec324a0023b1fc13ce0b4426f244c56c596403ad081bb821' 
  AND token = '6EqjM0GdTg6cbaVmz0gLXJNXZi/Imhal+fnY8WAJ4Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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