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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8cc5adef999be47b37af7624e590d9148c4442dd2e14aaff56ba06507408ed7' 
  AND token = 'W2DTQItdA3wDJFo9Pvvwm2/cP63OXl8k1JKUOPUlwRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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