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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d2f215b6c19ce2e984ebc1c3377c84eb260d8e4f009609d689e7dc353ab91a' 
  AND token = 'zsQlvEek5S7Yt1WVPK4g3TzIyVCpoLCe1zRsUOxHnW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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