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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b87ef777d4b90d2f15da3e0df29ad6092f140c49bbf29d062bdef8754c88ce' 
  AND token = 'wuxGnV5AA4H7czqHpkcsQFWqarlfoV3W+LFB2AUPADo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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