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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '899d84c888669d6d83d50de87dd12d1dd6790685c7e8262a0b0d886d0b6f2ae7' 
  AND token = 'EECGk+Xv6fq2fVMqR9YbTR6cp9igXB4zTWlBXuIHCfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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