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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a83317c3b3c9955a28d61e1ab618d4e52652b8d12799908b569e64e0a6dfbf0' 
  AND token = 'brEYhoOLwincj47j1PbhQtyCo/34RZAMBlV7fiOuq5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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