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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b3526412ab4eb03b1e7298095995dd625aa548661b9decf6b06a9050f46dbc9' 
  AND token = '9RJD5hNnkDVLo2+SIChc/+W/UQCje9OtNQiokrLVH2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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