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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e63a1f8ca69b1fdeab47cedf50c85f011ed9d55657507206b538c544894dbef9' 
  AND token = 'ayHFBpQuznkWIT/ugM68vLRwLBgbh303dWFwKBObHXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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