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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89739a3407dae2140af78cab93295dca46aa30287c228258eea3d216411288a1' 
  AND token = 'TC3Zr+AatXzz2hWR0hhs7xK9GwerCf+LsAvcg2cPK9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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