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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82eac058e04c7e65296407dc905609095c334d0941fcda3ec55f1c01e855ea2' 
  AND token = 'fTrHtadT0zV+nJ5GEzzp5vNaCfu/JS4VKeN0fJVMapQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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