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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c0597a9473d448fc10d4bbe59da649a655cc696ddc68e7aa2027916eba5ae6' 
  AND token = 'uQ5MY2e2fPTU/oF+Ys95x25wzrXeWwJiZsQAegCJl+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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