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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '891e5aa4737e96fbd349474aa9f7e0239d571c37ba3c347851970f848c227dd2' 
  AND token = '15u79B7IE8Tnt1ZkYOJ59MC4F1pzAwjzT0/pALUR+Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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