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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd60e7cb9ef6b00fc26c1c9721d0d704039e7d8a8d8a91501fe127a9eeccf74c7' 
  AND token = 'N6VzSnEFD4R8UOCyWoDelsVLuD2EAwOQ8Da7PmMyvAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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