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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87793bd1edd840d1a2d20ac997372d9e669921d42ade5f5b172137656222fe74' 
  AND token = 'w8OukLF4mNg3+PVsXUhI9eeooB6pksygyhhNGay9OAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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