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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f28b863349524d866995d52e12312a68dec903cef8daebfd17c0a0ef32882f5d' 
  AND token = 'V+SkMGZ7Wzcllvo7TSVCVoQxBaCX3yQ5kD9CM3CBEbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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