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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83068e942bef23a91923cf20d5f40b2675e2a17ff49cc95a6cb43cbe33e8e71' 
  AND token = 'zoDgkSvG5jayZuA62XgwwKKSb3JbJk6t/chlCiiA4k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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