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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db2736067a87a6057f348bfb56d95e15977e272fd6515de746ac9bb4d390c21a' 
  AND token = 'Cu+ln4ieo7cu7Mu6ZUEl/YcI+W46BhruYiAbZAawCy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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