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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a0808f2a65a3e0c70b77d779e78a6a984102c87ed04c8f6ec85708650d113dd' 
  AND token = 'CBuGIwylLAPtNbwL8S7cpjMKFIjrhB1a9ok6kXMd99k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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