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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e86947a8e8c2776266d2cc37100dfecdec311f2619ea658f5aa7577cb59292b' 
  AND token = 'ObNX18//qHOQ71Zutzn2sNtQzKYP4vayWt9lo4aCVRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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