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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '511ab582e5898eceef6978fcb2cdf00dc757b908d466ec442ccb05b63fb901a0' 
  AND token = 'q6G/mQFtm3fKJ4flBgm9RfPGC4enJklGsh9JLEm3wqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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