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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7d0a704b4f531728e2857eb1483c39b021cfa68ccd9237f0679a9d18f7aede' 
  AND token = '7/z+97FaFguCNtP/gBxEPezooNuq3s0+XHNxgTIqWOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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