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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30470e3085a1ed3e59147f0b92cb9e02ac114805fb6ff7d6ee23776b3232ab68' 
  AND token = 'ZzG3SagkAf/uYYPOQn3PLOp4K540YGPOz77ale6O/P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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