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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5570c374a2dc7e05758f2f9fe5ded436ab9ee83e10da2fdf2b05cb0bedb08d2b' 
  AND token = 'FRG8oGDwamsjE5xFsbHiHXEnq5VxvhjAHVwqX7BEJZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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