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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '211f5a522e8ec4d1a9af7e8c38696e2ffeac21febc1544d0573c5ec8c88c2fd4' 
  AND token = 'bbCmnt7QE6dYQNUSznt1Af/GEArPmjr/HfefiWkefX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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