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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da2a5c1f46642e74748951dbed6ab9fe6df4acf6550465459c4f178eb9a21ca' 
  AND token = 'RlNBDBB7GvfIsdbYDvmNv51c/senZWMFM3k3h1LRdok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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