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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b41ee807856f5ed590f2ea3f45ddae50b7f3d46cefe52d6f9c5585ebb44da55' 
  AND token = '5n23ikS8znpeg3War8pe364Y67ILNxMpI1fa/v6YGh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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