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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8bf74e286d64c1c4433a91a3bb9a3bbffd17dd21a1d662a00e62b4b2ce8f923' 
  AND token = 'm6mvGPyt3Q7NZXNkeQoDfDDHEhnb5Ox8dblVM8mTlf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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