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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c49b0e980395f1709bb0bfac904d0027274344e049b542826c1a0fb1c6843e' 
  AND token = 'jThAsFi1h9qkvK88W/1K81dwY6WdIVeO83WYR7mJPC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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