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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df5b5815738766c3cf29c44b12b43eb2b41ced9dc5972d51935820f10356069d' 
  AND token = 'iOiFM4re0xCfNiXLeNsofl6bT708kT8kvuGdlaWvjPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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