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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c4115befa85d32c421aa5f27774d4ccb6b261688e6a0299aebe5507d4432e5' 
  AND token = 'IsUPs8vChE+i5i8pc7joOu+pUcoNfiTcw+9wGPgSmeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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