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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fa3333a000932f81598efe9e508ce72cf22101e615f0f2b11494eb8ba48c1e5' 
  AND token = 'AtQHdIOSFIp+sH+yxAb2I8vFHP0XbMVeJC215BvT8WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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