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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '977770ac55b92900f7f2f43d636e7357962c9963c669b05dde0757338f00cc2e' 
  AND token = '4jlooBPrNTvCw7gdBWNXVTPEDfxMA74sxkl4eTy+jV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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