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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1061e2f7eabb8f168c45fa08a0568603a0f810bf8ec70dd7f61789a9897b9756' 
  AND token = 't1YY7Bv9PFfdsIV7gSWn72r6jnlkte9wgumRGEJTXEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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