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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c816a7e6909def658223889632cd23308da9552ad3fd01e2fae6b58a7669fb2d' 
  AND token = 'v8l9BuGfYrh/m4DkQgu2zaBiQ4fdc5YWeHpkDqI+O34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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