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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c85014d08091e22279e3b895003b045e1d8bdd75ae0ecf66a7de5aff50843262' 
  AND token = '4bbIxGLKHf20gAtT2kX2EemQjtTDvP2AKFhJPpDg63Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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