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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '751d16c4b10deb522fe87746dd0085e8eeb8511cf082fda424657723070c57e8' 
  AND token = 'of0MKFyAwbU31Us4wLYu+WHckA2AcxI9cOnTP49GSgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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