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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97183396804c0f4046c79ef765d06790f7638e3a240dfcf967604a5a92fa26d6' 
  AND token = 'LpFWUUFuElmVqoVXMe74oP4USaRd51j3oCBjmYjbj9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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