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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12876592ba881f2c2284b2b8ec27e295fa8dfe7c0964bbe2b12caa542a8eaab9' 
  AND token = 'pYr4PkHxbrkC3aIweNm7ZfXBIwzbCQd6XE85Vux9VwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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