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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e76d074081066422edf220557b2b7a35b68776b34a2bfe04c7c797932b7b8d94' 
  AND token = 'hpKq2gVvOp+8rOKAewbzLkrchRHU0dVLasb2gSzCUpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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