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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a2413c24b497192af2ea84a003637beb0b2482c26b007dd8598e08a6834b12' 
  AND token = '9hfyS1Xc3dYDSShLMn/JVSjThSK6LNBlnfyqIEx+bZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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