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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aff1a256744ef7e6edb09ef1831ffda918d9ef86bcd6efb360fb670972669bd4' 
  AND token = 'l2l8dYcBQloYb2DXO9nVkxiWq73LxGQjDQGf23JOyeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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