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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be5c6b5e2aecd6e6c1a474c8ad85702a9e8ed6e6a57ebb4f4c25bbb2e02ba2c' 
  AND token = 'aYLjTc/WLQZHL4Do5ZoVetgIv414JwNWxX0t9viieQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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