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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b9f8eeded01529f2524f65c619d48d6cdf4274fe8ef56ef080f700aa0054140' 
  AND token = 'pzysedpk+QRZfyyS85E80SKeWC7Wfo9YicDsc1qCeF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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