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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e35bd310ad772baf1840608c8883225b1331304a9cea5abeadcfc9eb12eda3c' 
  AND token = 't3Xf8NJzrIgDTomllgJgndLNJJ2vH74YAaZ+D/uGAIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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