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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf1744bdca744c9a93590bb6aa7a79d7cf58aa463ba65d3c3f0b87660c933717' 
  AND token = 'fMnXdFgxoV0+2IsUWfe1vsOzbFlmNQSNejQRH3fDe/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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