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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f310ce5cb91c88431c775c344af12d70b78fb3a2e2677ee83048d6f8eba3752' 
  AND token = '/2O8IwOmz6BTOsma6L1tSz9bI8wlNZHiqlfSK8nhU+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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