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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f2430c5ed5797e65f71f51d65f4f9e1351b031e4fa457184711b0fb43890a68' 
  AND token = '9YlNr738oblnocEiw/cE7eEQHbw+V5YhRI7dKEWtkZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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